Perhaps you should try some spelling variations:
yang zhang » zhang zhang, yang yang, tang zheng
jeong yeon » jeong hyeok, jeang yean, seung yeon
yan zhang » yuan chang, bin zhang, han chang
low model » flow model, law model, solow model
ii testi » i testi, ii test, ai test
law pain » law main, law part, law past

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yang zhang) OR (yan zhang)) ii testi ((low model) or (law pain)) jeong yeon ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yang zhang) OR (yan zhang)) ii testi ((low model) OR (law pain)) jeong yeon ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yang zhang) OR (yan zhang)) ii testi ((low model) or (law pain)) jeong yeon ;*".